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A TEPCO spokesman told a press conference in Tokyo on Thursday that the leak happened because workers miscalculated the amount of water the tank was capable of holding due to it sitting on a slope. Japanese Chief Cabinet Secretary Yoshihide Suga said following the announcement that measures to stop the leaks were insufficient and pledged to work with TEPCO to prevent similar incidents.

The estimated 430-liter leak occurred as crews transferred rainwater that had collected at the plant into a storage tank, Masayuki Ono, an official at the utility's plant siting department, said today at a press conference in Tokyo. The tank was already partially filled with water that had been used to cool nuclear fuel in the Fukushima Dai-Ichi station's reactors, Mayumi Yoshida, a spokeswoman for the company known as Tepco, said by phone.